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Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018 | Jul. 23, 2018
--- | --- | --- | ---
Fair Value |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Long-term debt, fair value | $ 875.9 | $ 851.5 |
Carrying Value |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Long-term debt, fair value | $ 850.3 | $ 850.4 |
3.20% Senior Notes, due June 2023 |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Stated interest rate | 3.20% | 3.20% |
3.37% Senior Notes, due June 2025 |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Stated interest rate | 3.37% | 3.37% |
4.50% Senior Notes, due December 2020 |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Stated interest rate | 4.50% | 4.50% |
4.20% Senior Notes, due December 2021 |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Stated interest rate | 4.20% | 4.20% |
Finger Lakes Instrumentation (FLI) |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Contingent consideration |  |  | $ 3.4
Finger Lakes Instrumentation (FLI) | Other Noncurrent Liabilities |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Contingent consideration | $ 3.4 |  |

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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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